%0 Journal Article
%T Sonochemical Synthesis of Silver Nanoparticles Using Starch: A Comparison
%A Brajesh Kumar
%A Kumari Smita
%A Luis Cumbal
%A Alexis Debut
%A Ravinandan Nath Pathak
%J Bioinorganic Chemistry and Applications
%D 2014
%I Hindawi Publishing Corporation
%R 10.1155/2014/784268
%X A novel approach was applied to synthesize silver nanoparticles using starch under sonication. Colloidal silver nanoparticles solution exhibited an increase of absorption from 420 to 440£¿nm with increase starch quantity. Transmission electron microscopy followed by selected area electron diffraction pattern analysis indicated the formation of spherical, polydispersed, amorphous, silver nanoparticles of diameter ranging from 23 to 97£¿nm with mean particle size of 45.6£¿nm. Selected area electron diffraction (SAED) confirmed partial crystalline and amorphous nature of silver nanoparticles. Silver nanoparticles synthesized in this manner can be used for synthesis of 2-aryl substituted benzimidazoles which have numerous biomedical applications. The optimized reaction conditions include 10£¿ml of 1£¿mM AgNO3, 25£¿mg starch, 11 pH range, and sonication for 20£¿min at room temperature. 1. Introduction Nanoscale materials have received considerable attention because their unusual optical, chemical, photoelectrochemical, and electronic properties differ significantly from those of atoms and molecules as well as those of bulk materials [1¨C3]. The synthesis of nanomaterials with the desired quality is one of the most exciting aspects in modern nanoscience and nanotechnology [4]. Colloidal nanoparticles are small in diameter but large in surface area and huge in current many exclusive medical and industrial applications such as biological engineering, catalysts, and electronic devices [5]. Colloidal silver nanoparticle (Ag-NP) with natural macromolecule can be fabricated by physical [6, 7] and chemical reduction [8¨C10] methods. Nowadays, biomass starch as a raw material for the synthesis of Ag-Nps has reflected significant superiority in some process. However, no literature is available on its preparation in starch at different pH and polysaccharide by ultrasonic field. The sonochemical methods are as follows: formation, development, and the implosion of the microcavities [11]. When solutions are exposed to ultrasonic irradiation, bubbles in the solution could be imploded by acoustic fields. Cavitation¡¯s bubble collapse can also induce a shock wave in the solution and drive the rapid impact of the liquid to the surface of the particles [12]. Use of the sonoelectrochemical method for the preparation of spheres, rods, and dendrites shaped Ag-Nps with nitriloacetate (NTA) [13]. It was found that the electrolyte composition that comes along reaction time can greatly affect the shape and growth of the NPs. Branched silver structure with 440£¿nm and average diameter of 11.5£¿nm
%U http://www.hindawi.com/journals/bca/2014/784268/